Firefox refusing connection to proxy server or firefox requires proxy authentication
Running the latest version of firefox on Mac Pro Desktop - running 10.8 Fresh install of firefox and getting both message. Firefox is configured using the system proxy configuration currently. I have also try no proxy under advanced. I've also try all the various about:config solutions and steps. Nothing seems to work. This Mac Pro is a domain joined desktop in a corporate environment so it DOES require a proxy. Network settings in Mac OS X 10.8 is using the auto configuration script. Safari and Google Chrome works without any issues. Need to get firefox to work because it's uses a color management software that is only compatible with Firefox. Any clues at to what to try next? Thanks.
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Hello,
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: This will cause you to lose any Extensions and some Preferences.
- Open websites will not be saved in Firefox versions lower than 25.
To Reset Firefox do the following:
For Firefox versions previous to 29.0:
- Go to Firefox > Help > Troubleshooting Information.
- Click the "Reset Firefox"
button.
- Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
- Firefox will open with all factory defaults applied.
For Firefox 29.0 and above:
- Click the menu button
, click help 
and select Troubleshooting Information.Now, a new tab containing your troubleshooting information should open.
- At the top right corner of the page, you should see a button that says "Reset Firefox". Click on it.
- Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
- Firefox will open with all factory defaults applied.
Further information can be found in the Refresh Firefox - reset add-ons and settings article.
Did this fix your problems? Please report back to us!
Thank you.
Hello,
I think if you use a domain joined desktop in a corporate environment it will require a proxy and not just that but proxy authentication too. In that case you need a username and password which your IT department can provide or you can use username and password of some other people (if that's possible) . If there is proxy there must be proxy authentication.
If I didn't understand me your problem please get back to me and explain.
Have a good day ahead.
Tried reset already - did not help. Yes I understand proxy server needs authentication. User does not even get a prompt for credentials.
Both suggestions above already tried previously to posting. thanks.
See:
NTLMv1 auth has been disabled, NTLM support on non-Windows platforms is now deprecated
- about:config page: network.negotiate-auth.allow-insecure-ntlm-v1 = true
So they have created another pref that is true by default to enable NTLMv1 for secure connections only.
- network.negotiate-auth.allow-insecure-ntlm-v1-https = true
- network.negotiate-auth.allow-insecure-ntlm-v1 = false
Bug 1023748 - Allow NTLMv1 over SSL/TLS, or intranet access is broken on Firefox 30 for non-Windows platforms